Wear and Corrosion Performance of Al-Cu-Fe-(Cr) Quasicrystalline Coatings Produced by HVOF

Autor(es)

Wolf, Witor ^{[1, 2]} ; Koga, Guilherme Y. ^[3] ; Schulz, Robert ^[4] ; Savoie, Sylvio ^[4] ; Kiminami, Claudio S. ^[3] ; Bolfarini, Claudemiro ^[3] ; Botta, Walter J. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Programa Posgrad Ciencia & Engn Mat, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Minas Gerais, Dept Engn Met & Mat, Av Antonio Carlos 6627, BR-31270901 Belo Horizonte, MG - Brazil

^[3] Univ Fed Sao Carlos, Dept Engn Mat, Rod Washington Luiz, Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[4] Hydroquebec Res Inst, 1800 Boul Lionel Boulet, Varennes, PQ J3X 1S1 - Canada

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF THERMAL SPRAY TECHNOLOGY; v. 29, n. 5 MAY 2020.
• Citações Web of Science: 0

Resumo

High-velocity oxygen fuel coatings were produced using gas-atomized Al62.5Cu25Fe12.5 and Al67Cu20Fe5Cr8 powders onto a ferritic stainless-steel substrate, resulting in two similar microstructures, consisting mainly of quasicrystalline phases. The goal of this work was to evaluate the performance of the quasicrystalline coatings under standard wear and corrosion tests. The samples were characterized by x-ray diffraction and scanning and transmission electron microscopy. Wear and friction behavior of the coatings and substrate were assessed by pin-on-disk tests. Vickers microhardness was also measured. The corrosion resistance was assessed through electrochemical measurements performed in alkaline and acidic medium in the absence and in the presence of chlorides. The coefficient of friction of the quasicrystalline coatings were inferior to the substrate, particularly the Al-Cu-Fe coating, with values close to 0.1. The Al62.5Cu25Fe12.5 alloy also showed the lowest specific wear rate, 1.7 x 10(-4) mm(3)/N m, among the materials tested. In the presence of chlorides, the chromium containing coating presented better corrosion resistance with less surface damage after testing. However, the corrosion rate of the coating samples was low in both chloride-free alkaline and acidic conditions. Both Al62.5Cu25Fe12.5 and Al67Cu20Fe5Cr8 coatings presented corrosion potential considerably lower than the substrate for all tested media, which may be interesting for cathodic protection. (AU)

• Processo FAPESP: 15/09008-0 - Fabricação de ligas de alumínio com fases quasicristalinas e intermetálicas com baixo coeficiente de atrito e baixa energia de adesão superficial para aplicação como revestimentos na indústria petroquímica
• Beneficiário: Witor Wolf
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 13/05987-8 - Processamento e caracterização de ligas metálicas amorfas, metaestáveis e nano-estruturadas
• Beneficiário: Claudio Shyinti Kiminami
• Modalidade de apoio: Auxílio à Pesquisa - Temático